(F).ORGANIC MENTAL DISORDERS OR ORGANIC BRAIN SYNDROME-Organic mental disorders or organic brain syndrome ETIOLOGY OF DELIRIUM *Vascular : Hypertensive encephalopathy, intra cranial haemorrhage and cerebral arteriosclerosis etc. *Neurological : epilepsy, stroke *Infection : Meningitis, Encephalitis *Intoxication: Withdrawal effect or chronic intoxication of sedative drugs. *Traumatic : In subdural and epidural hematoma, hit stroke. *Vitamin Deficiency : Vitamin B1 (Thiamine). *Endocrine and Metabolic: Diabetic coma, shock, hyperthyroidism, hepatic failure. Metals: Heavy